Got it. It has to be something with converter itself since if you simply extract that archive and compress it again, it creates correct bh file (which is what Converter is doing!).
We will check it out.
thanks,

@Brian-Gregory so in one of the latest versions we now clean up old program group, rename it to PowerArchiver and also delete old shortcut to PA 2017. So now when you upgrade from 2017 to 2018 all is nice and proper on Windows 7 and earlier system. Thanks!